Implement support for CHROMIUM_NV_path_rendering pseudo extension

src/gpu/gl/GrGLShaderBuilder.h

Index: src/gpu/gl/GrGLShaderBuilder.h
diff --git a/src/gpu/gl/GrGLShaderBuilder.h b/src/gpu/gl/GrGLShaderBuilder.h
index 233bb524f50afee552074b9cdce7fc0adaa63102..d089e8d77085e4163ae2ad7d58220dd7d89c4261 100644
--- a/src/gpu/gl/GrGLShaderBuilder.h
+++ b/src/gpu/gl/GrGLShaderBuilder.h
@@ -50,8 +50,9 @@ public:
      */
     enum GLSLFeature {
         kStandardDerivatives_GLSLFeature = 0,
+        kTexCoordSupport_GLSLFeature,
 
-        kLastGLSLFeature = kStandardDerivatives_GLSLFeature
+        kLastGLSLFeature = kTexCoordSupport_GLSLFeature
     };
 
     /**
@@ -465,6 +466,8 @@ public:
                 const EffectKey effectKeys[],
                 int effectCnt,
                 GrGLSLExpr4* inOutFSColor) SK_OVERRIDE;
+protected:
+    virtual bool compileAndAttachShaders(GrGLuint programId, SkTDArray<GrGLuint>* shaderIds) const SK_OVERRIDE;
 
 private:
     int fNumTexCoordSets;